chore: (WIP) group controllers, slightly annotate code

Controllers/AuthController.cs

@@ -22,6 +22,7 @@ public class AuthController : ControllerBase
         _appsettings = appsettings;
     }
 
+    // POST /api/v1/auth/login
     [HttpPost("login")]
     public async Task<IActionResult> Login([FromBody] UserLoginDTO formUser, GeneralUseHelpers guhf)
     {
@@ -48,6 +49,7 @@ public class AuthController : ControllerBase
         } else return Unauthorized(new {status = "error", error_msg = "Unknown pair of email and password"});
     }
 
+    // GET /api/v1/auth/some_values
     [HttpGet("some_values")]
     [Authorize]
     public IActionResult GetValues()